Five-year-old Maggie Sitzberger of Hales Corners carefully picks up her Culver's sundae during the summer reading program kickoff party at the Hales Corners Library on Monday, June 11, 2018.(Photo: Scott Ash/Now News Group)

Butter Burgers have gone big-time.

Culver’s, the restaurant chain founded in Wisconsin and built around burgers and custard, has opened its 700th store.

Perhaps it is fitting that the 700th store is in Chandler, Ariz., a region of the country where lots of Wisconsin expatriates go to hide out from winter.

Founded July 18, 1984, in Sauk City by members of the Culver family, Culver’s has seen rapid growth in recent years.

Culver’s is currently in 25 states after entering Alabama in 2018. The chain opened 46 new restaurants in 2018, and there are plans for 50 more in 2019.

“…It’s amazing how far we’ve come from opening our very first restaurant ...," Joe Koss, president and chief executive officer, said in a statement. “I’m so happy for our franchisees, team members and our guests who have brought us to where we are today.”